Title:
MAGNETIC RESONANCE IMAGING DEVICE
Document Type and Number:
WIPO Patent Application WO/2016/208547
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a magnet device which has an excellent uniform magnetic field performance even if a magnetic material having low purity but high machining accuracy is used as a magnetic body for magnetic field adjustment. In order to resolve this problem, a magnetic body for magnetic field adjustment is configured by combining a low-purity magnetic body provided with a groove or a protuberance, with a high-purity magnetic body in the shape of a flat plate or a shape equivalent to a flat plate, wherein the thickness of the high-purity magnetic body is adjusted in accordance with the deviation in the saturation magnetization of the low-purity magnetic body. In this way, the number of machining steps can be reduced by using a magnetic material having high machining accuracy for parts having a complex shape, and an improvement in the uniform magnetic field performance can be achieved by using the high-purity magnetic body to compensate for deviations in the saturation magnetization.
Inventors:
SHIBATA KEIICHIROU (JP)
ABE MITSUSHI (JP)
ABE MITSUSHI (JP)
Application Number:
PCT/JP2016/068301
Publication Date:
December 29, 2016
Filing Date:
June 20, 2016
Export Citation:
Assignee:
HITACHI LTD (JP)
International Classes:
A61B5/055; A61B5/05; G01R33/3815; H01F6/00
Domestic Patent References:
| WO1999052427A1 | 1999-10-21 |
Foreign References:
| JP2010088629A | 2010-04-22 | |||
| JPH0869913A | 1996-03-12 | |||
| JP2007046125A | 2007-02-22 |
Attorney, Agent or Firm:
ISONO INTERNATIONAL PATENT OFFICE, P. C. (JP)
Patent business corporation Isono international patent trademark office (JP)
Patent business corporation Isono international patent trademark office (JP)
Download PDF: